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nvmf/vfio-user: map the migration region as a local file

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We will report the live migration region to VM via sparse
mmap, offset after 0x1000 is the NVMe device state data
structure, and offset start from 0 is the structure
vfio_device_migration_info defined by the VFIO driver.

All accesses between 0x0-0x1000 will use the MMIO callbacks,
and accesses to NVMe device state will use shared memory map
way.

Change-Id: Ib456fc61f587c1bffa8b38506b4480a6066abe87
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7627
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Changpeng Liu 2021-09-22 20:19:08 +08:00 committed by Jim Harris
parent 0fb6a233ad
commit a3c55229aa
1 changed files with 62 additions and 0 deletions
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62
lib/nvmf/vfio_user.c
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@ -321,6 +321,9 @@ struct nvmf_vfio_user_endpoint {
int devmem_fd;
volatile uint32_t *doorbells;
int migr_fd;
void *migr_data;
struct spdk_nvme_transport_id trid;
const struct spdk_nvmf_subsystem *subsystem;
@ -363,6 +366,24 @@ nvmf_vfio_user_req_free(struct spdk_nvmf_request *req);
static struct nvmf_vfio_user_req *
get_nvmf_vfio_user_req(struct nvmf_vfio_user_sq *vu_sq);
static inline size_t
vfio_user_migr_data_len(void)
{
size_t len = 0;
len = NVMF_VFIO_USER_MAX_QPAIRS_PER_CTRLR * (sizeof(struct nvme_migr_sq_state) + sizeof(
struct nvme_migr_cq_state));
len += sizeof(struct nvme_migr_device_state);
len += NVME_REG_BAR0_SIZE;
len += NVME_REG_CFG_SIZE;
/* BAR4 */
len += NVME_BAR4_SIZE;
/* BAR5 */
len += NVME_BAR5_SIZE;
return SPDK_ALIGN_CEIL(len, PAGE_SIZE);
}
static int
nvme_cmd_map_prps(void *prv, struct spdk_nvme_cmd *cmd, struct iovec *iovs,
uint32_t max_iovcnt, uint32_t len, size_t mps,
@ -630,6 +651,14 @@ nvmf_vfio_user_destroy_endpoint(struct nvmf_vfio_user_endpoint *endpoint)
close(endpoint->devmem_fd);
}
if (endpoint->migr_data) {
munmap(endpoint->migr_data, vfio_user_migr_data_len());
}
if (endpoint->migr_fd > 0) {
close(endpoint->migr_fd);
}
if (endpoint->vfu_ctx) {
vfu_destroy_ctx(endpoint->vfu_ctx);
}
@ -2449,12 +2478,45 @@ nvmf_vfio_user_listen(struct spdk_nvmf_transport *transport,
goto out;
}
ret = snprintf(path, PATH_MAX, "%s/migr", endpoint_id(endpoint));
if (ret < 0 || ret >= PATH_MAX) {
SPDK_ERRLOG("%s: error to get migration file path: %s.\n", endpoint_id(endpoint),
spdk_strerror(errno));
ret = -1;
goto out;
}
ret = open(path, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
if (ret == -1) {
SPDK_ERRLOG("%s: failed to open device memory at %s: %s.\n",
endpoint_id(endpoint), path, spdk_strerror(errno));
goto out;
}
endpoint->migr_fd = ret;
ret = ftruncate(endpoint->migr_fd,
vfu_get_migr_register_area_size() + vfio_user_migr_data_len());
if (ret != 0) {
SPDK_ERRLOG("%s: error to ftruncate migration file %s: %s.\n", endpoint_id(endpoint), path,
spdk_strerror(errno));
goto out;
}
endpoint->migr_data = mmap(NULL, vfio_user_migr_data_len(),
PROT_READ | PROT_WRITE, MAP_SHARED, endpoint->migr_fd, vfu_get_migr_register_area_size());
if (endpoint->migr_data == MAP_FAILED) {
SPDK_ERRLOG("%s: error to mmap file %s: %s.\n", endpoint_id(endpoint), path, spdk_strerror(errno));
endpoint->migr_data = NULL;
ret = -1;
goto out;
}
ret = snprintf(uuid, PATH_MAX, "%s/cntrl", endpoint_id(endpoint));
if (ret < 0 || ret >= PATH_MAX) {
SPDK_ERRLOG("%s: error to get ctrlr file path: %s\n", endpoint_id(endpoint), spdk_strerror(errno));
ret = -1;
goto out;
}
endpoint->vfu_ctx = vfu_create_ctx(VFU_TRANS_SOCK, uuid, LIBVFIO_USER_FLAG_ATTACH_NB,
endpoint, VFU_DEV_TYPE_PCI);
if (endpoint->vfu_ctx == NULL) {